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ASTM F3626-23

(Guide)

Standard Guide for Additive Manufacturing — Test Artifacts — Accelerated Build Quality Assurance for Laser Beam Powder Bed Fusion (PBF-LB)

Standard Guide for Additive Manufacturing — Test Artifacts — Accelerated Build Quality Assurance for Laser Beam Powder Bed Fusion (PBF-LB)

SIGNIFICANCE AND USE
5.1 This guide describes the use of torque and angle-of-twist data as a preliminary acceptance criteria for a production run utilizing a previously qualified AM process through periodical or continuous evaluation. A torsion device (for example, torque wrench, instrumented lathe with torque readout) is used to break strategically placed torque specimens within the build volume in the as-built state to provide evidence of build health. If a round of tests from a production run is determined to fall outside of some criteria (for example: 3 standard deviations from the mean or other user defined criteria), additional qualification procedures should be performed to ensure the AM machine or process health are acceptable.
Note 1: It is advantageous to locate the specimen at the same build height and near-critical locations of the part or component being fabricated for the evaluation to be representative of the specific region.  
5.2 This guide is not intended to replace rigorous qualification procedures and should only be considered as a preliminary acceptance criterion to increase confidence that an AM machine or process has not been significantly compromised.
SCOPE
1.1 This guide illustrates a test specimen geometry and testing protocol that can be used to assess the quality of a metal powder bed fusion build cycle as it could be affected by major system errors (for example, corrupted calibration, disrupted inert gas flow, laser wear) severely affecting the quality of materials fabricated by laser beam powder bed fusion (PBF-LB).  
1.2 This method is designed to interrupt the manufacturing process if poor material quality is identified through go/no-go torque/angle of twist measurements of witness coupons after each fabrication.  
1.3 Units—The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this guide.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
14-Feb-2023
ICS
25.030 - Additive manufacturing
Technical Committee
F42 - Additive Manufacturing Technologies
Drafting Committee
F42.01 - Test Methods
Current Stage
Ref Project

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ASTM F3626-23 - Standard Guide for Additive Manufacturing — Test Artifacts — Accelerated Build Quality Assurance for Laser Beam Powder Bed Fusion (PBF-LB)ASTM F3626-23 - Standard Guide for Additive Manufacturing — Test Artifacts — Accelerated Build Quality Assurance for Laser Beam Powder Bed Fusion (PBF-LB)
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ASTM F3626-23 - Standard Guide for Additive Manufacturing — Test Artifacts — Accelerated Build Quality Assurance for Laser Beam Powder Bed Fusion (PBF-LB)
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F3626 − 23
Standard Guide for
Additive Manufacturing — Test Artifacts — Accelerated
Build Quality Assurance for Laser Beam Powder Bed Fusion
1
(PBF-LB)
This standard is issued under the fixed designation F3626; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope men Alignment Under Tensile and Compressive Axial
Force Application
1.1 This guide illustrates a test specimen geometry and
2
2.2 ISO/ASTM Standard:
testing protocol that can be used to assess the quality of a metal
ISO/ASTM 52900 Additive manufacturing — General prin-
powder bed fusion build cycle as it could be affected by major
ciples — Fundamentals and vocabulary
system errors (for example, corrupted calibration, disrupted
inert gas flow, laser wear) severely affecting the quality of
3. Terminology
materials fabricated by laser beam powder bed fusion (PBF-
LB).
3.1 Definitions—Terminology relating to additive manufac-
turing in ISO/ASTM 52900 should apply.
1.2 This method is designed to interrupt the manufacturing
process if poor material quality is identified through go/no-go
4. Summary
torque/angle of twist measurements of witness coupons after
each fabrication.
4.1 Directly after a build cycle is completed, witness speci-
mens in their as-built state (prior to any post-processing) are
1.3 Units—The values stated in SI units are to be regarded
torqued to fracture. The maximum value of torque and (if
as the standard. No other units of measurement are included in
necessary) angle-of-twist are recorded. Identifying measure-
this guide.
ments of torque or angle-of-twist or both outside of a specified
1.4 This standard does not purport to address all of the
range of variation are cause to interrupt the production cycle
safety concerns, if any, associated with its use. It is the
until the additive manufacturing (AM) machine performance
responsibility of the user of this standard to establish appro-
and resulting material quality is further evaluated.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
5. Significance and Use
1.5 This international standard was developed in accor-
5.1 This guide describes the use of torque and angle-of-twist
dance with internationally recognized principles on standard-
data as a preliminary acceptance criteria for a production run
ization established in the Decision on Principles for the
utilizing a previously qualified AM process through periodical
Development of International Standards, Guides and Recom-
or continuous evaluation. A torsion device (for example, torque
mendations issued by the World Trade Organization Technical
wrench, instrumented lathe with torque readout) is used to
Barriers to Trade (TBT) Committee.
break strategically placed torque specimens within the build
2. Referenced Documents volume in the as-built state to provide evidence of build health.
2
If a round of tests from a production run is determined to fall
2.1 ASTM Standards:
outside of some criteria (for example: 3 standard deviations
E143 Test Method for Shear Modulus at Room Temperature
from the mean or other user defined criteria), additional
E1012 Practice for Verification of Testing Frame and Speci-
qualification procedures should be performed to ensure the AM
machine or process health are acceptable.
1
This guide is under the jurisdiction of ASTM Committee F42 on Additive
NOTE 1—It is advantageous to locate the specimen at the same build
Manufacturing Technologies and is the direct responsibility of Subcommittee
height and near-critical locations of the part or component being fabri-
F42.01 on Test Methods.
cated for the evaluation to be representative of the specific region.
Current edition approved Feb. 15, 2023. Published April 2023. DOI: 10.1520/
F3626-23.
5.2 This guide is not intended to replace rigorous qualifica-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
tion procedures and should only be considered as a preliminary
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
acceptance criterion to increase confidence that an AM ma-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. chine or process has not been significantly compromised.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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1.7.5 The implementation details of how data should be imported to proprietary data management systems from the common data exchange format.  
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1.7.7 Guidelines for creating unique identifiers for data module records  
1.8 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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Standard Guide for Additive Manufacturing – Feedstock – Particle Shape Image Analysis by Optical Photography to Identify and Quantify the Agglomerates/Satellites in Metal Powder Feedstock

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5.1 Particle characterization, especially particle size distribution, has been an important parameter for quality control (QC) and research and development (R&D) in a very wide variety of industries and markets, anywhere a particulate system is a final product or an intermediate constituent somewhere in the process. But size alone is not a sufficient morphological measurement to use to understand many factors of the complete particle morphology of particulate systems and their effects on other properties. This information is expected to contribute to the understanding of the effects of shape on powder spreadability and flowability in the creation of the bed in powder bed fusion AM and the density and porosity of the final AM parts (definitions in ISO/ASTM 52900 and Terminology B243). Ultimately, specifications can be developed for quality control (QC) tolerances for these shape parameters that can be measured with a straightforward, fast automated analysis
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1.1 This guide explains how to characterize the quality of metal powder feedstock to additive manufacturing (AM) relative to the powder shape using automated static or dynamic image analysis by optical photography. This guide will describe the method(s) to measure powder shape parameters that can identify potentially detrimental powder characteristics and specifically describe how to identify and quantify the proportion of agglomerates/satellites and other irregularly shaped non-spherical powder particles in a powder batch.  
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